A controller for 97 MHz super-conducting QWR for NSC LINAC booster |
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Authors: | Gopal Joshi CI Sujo Bhuban Sahu Ashutosh Pandey Ajith Kumar Jitendra Karande |
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Institution: | (1) Electronics Division, Bhabha Atomic Research Centre, 400 085 Mumbai, India;(2) Nuclear Science Centre, 110 016 New Delhi, India;(3) Tata Institute of Fundamental Research, 400 005 Mumbai, India |
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Abstract: | A resonator controller has been implemented to stabilize the amplitude and phase of rf fields in the super-conducting resonators
of NSC LINAC. Due to reduced losses these resonators have intrinsic band width of the order of 0.1 Hz at 97 MHz whereas the
vibration-induced center frequency changes are of the order of a few tens of hertz. In the control strategy followed, the
resonator is made the frequency selective part of an oscillator. The phase lock is achieved by dynamically adding a phase
shift in the oscillator. A slow tuner minimizes the slow drifts in the resonator center frequency. In this paper we present
the control strategy, implementation details and performance obtained with this controller. |
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Keywords: | Resonator variable reactance method dynamic phase control phase amplitude stabilization |
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